Download Stellar Converter for OLM to easily migrate your OLM file to office365. This tool supports MS Outlook 2019, 2016, 2013, 2010, 2007 for Windows and Windows 10, 8.1, 8 & 7. You need to execute a few steps to migrate Mac Outlook OLM files into office 365 format with this olm to pst converter.

After installing the tool, Select OLM Files, or if you don't know the location, you can find the file with the help of this tool.
The tool provides preview OLM mailboxes in the software panel, choosing desired email folders, calendar, contacts, journals, etc., and Now click on Next to continue.
Select office 365 and migrate the mailboxes easily. You need to add your Office365 Credentials.
OLM to PST conversion process is running and directly exported to your office 365 account.